Mount Prospect, Illinois 7 Day Weather Forecast

Wx Forecast - Wx Discussion - Wx Aviation

018
FXUS63 KLOT 101726
AFDLOT

Area Forecast Discussion
National Weather Service Chicago/Romeoville, IL
1226 PM CDT Sun May 10 2026

.KEY MESSAGES...

- Cooler and continued dry conditions today and Monday, with
  shower and storm chances returning on Tuesday.

&&

.DISCUSSION...
Issued at 158 AM CDT Sun May 10 2026

High pressure will drift across the western Great Lakes through
Monday as deep troughing over eastern Canada edges eastward.
This will set the stage for a seasonably cool, but dry and
mostly clear period for the area. Continued deep diurnal mixing
will promote sporadic gusts to 25(20) mph or higher and RH
values under 30(35) percent this afternoon (Monday afternoon),
resulting in a brief period of elevated brush fire conditions
each afternoon.

With high pressure nearing from the northwest and dry
conditions noted by PWATs under 0.4 inches, another unseasonably
chilly night with some patchy frost for outlying areas of far
northern Illinois is possible late. Some mid-level cloud cover
associated with a wave/elongated trough currently over southern
Manitoba will cross the area tonight and may be keep temps just
warm enough to limit coverage of frost. Conditions appear too
marginal to issue a Frost Advisory for counties including and
north of the I-88 corridor.

A modestly strong trough tracking southeastward over the
Boundary Waters early Tuesday will brush the area to the north
with WAA-induced showers during the morning, followed by a
potential axis of showers and some thunderstorms associated with
a cold front Tuesday afternoon into the evening. Will need to
monitor for a low-end isolated strong storm risk during this
time as a decent kinematic field compensates for marginal mid-
level lapse rates and a somewhat dry low-level profile.

High pressure and a return to seasonably cool and dry
conditions will return Wednesday and Thursday. The broader flow
across North America is then progged to transition into a more
active northern stream across the CONUS, with increasing
rain/storm chances and potentially a period of seasonably warm
conditions beginning as early as Friday and especially late next
weekend into the following week.

Kluber

&&

.AVIATION /18Z TAFS THROUGH 00Z TUESDAY/...
Issued at 1226 PM CDT Sun May 10 2026

Key Aviation Messages for the current TAF period:

- A lake breeze is expected to switch prevailing winds from
  northwest to northeast this afternoon. Low confidence in the
  exact timing of the wind shift at Chicago terminals.

VFR cumulus clouds have bubbled up across northern Illinois, but
the TAFs will remain VFR through the forecast window. The
primary impact will be wind directions. Obs in the interior
part of Illinois mostly display northwest winds with occasional
gusts up to 20 knots. However, the TORD radar is showing a weak
lake breeze moving through Cook County with surface
observations out of the northeast. There is lower confidence in
the exact timing of wind directions flipping from northwest to
northeast and whether or not the northwest winds will help the
lake breeze stall. The lake breeze will be monitored closely
through the afternoon for any amendments needed to adjust
timing.

Once the lake breeze passes, winds are expected to remain east-
northeast through the rest of the forecast package. Winds are
expected to favor more easterly this evening to overnight, and
then favor more northeasterly prior to daybreak tomorrow as a
weak front moves down the lake increasing winds to just over 10
knots. There is a little slug of mid level moisture out ahead
of this front. While a brief sprinkle is possible, there is a
better chance in it remaining virga; thus, the TAFs were kept
dry.

DK

&&

.LOT WATCHES/WARNINGS/ADVISORIES...
IL...None.
IN...None.
LM...None.

&&

$$

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